Theory of the magnetic response in finite two-dimensional superconductors

F. Sebastián Bergeret; Ilya V. Tokatly

doi:10.1103/PhysRevB.102.060506

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Theory of the magnetic response in finite two-dimensional superconductors

F. Sebastián Bergeret, Ilya V. Tokatly

DOI 10.1103/PhysRevB.102.060506 · Physical Review B

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Abstract

We present a theory of magnetic response in finite-size two-dimensional superconductors with Rashba spin-orbit coupling. The interplay between the latter and an in-plane Zeeman field leads on the one hand to an out-of-plane spin polarization which accumulates at the edges of the sample over the superconducting coherence length, and on the other hand, to circulating supercurrents decaying away from the edge over a macroscopic scale. In a long finite stripe of width W, both the spin polarization and the currents contribute to the total magnetic moment induced at the stripe ends. These two contributions scale with powers of W such that for sufficiently large samples it can be detected by current magnetometry techniques.